工业Ni-Mo/Al_2O_3催化剂上异戊二烯选择性加氢宏观动力学  

Global Kinetics of Isoprene Selective Hydrogenation over the Commercial Ni-Mo/Al_2O_3 Catalyst

作　　者：仝云娜[1] 张学军 王欣[1] 张舜光[1] 段艳[1] 侯凯湖[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]中国石油石油化工研究院,北京100195

出　　处：《高校化学工程学报》2011年第3期437-441,共5页Journal of Chemical Engineering of Chinese Universities

摘　　要：在固定床积分反应器中研究了异戊二烯在工业Ni-Mo/Al2O3催化剂上选择性加氢的宏观动力学。以异戊二烯＋正辛烷为模拟原料,在温度70~120℃,压力0.5~2.0 MPa,氢油体积比20~40,液时空速2~36 h-1条件下,考察了温度、反应压力、液时空速、氢油比等对二烯烃选择性加氢反应的影响;采用幂函数动力学模型拟合得到了异戊二烯选择性加氢串联反应的宏观动力学。结果表明异戊二烯加氢生成异戊烯的反应活化能为44.3 kJ·mol-1,对异戊二烯和氢气的反应级数分别为0.98和0.27;异戊烯加氢生成异戊烷的反应活化能为101.1 kJ·mol-1,对异戊烯和氢气的反应级数分别为1.57和1.09。异戊二烯转化率和异戊烯选择性实验值与模型预测值的比较和统计检验结果表明模型是适宜的。Global kinetics of isoprene selective hydrogenation over the commercial Ni-Mo/Al2O3 catalyst was investigated by using an integral fixed bed reactor.The influences of reaction temperature,reaction pressure,hydrogen/oil volume ratio and liquid hourly space velocity on the selective hydrogenation reaction were studied by using the isoprene ＋ n-octane solution as model feed and under following conditions： reaction temperature 70~120℃,reaction pressure 0.5~2.0 MPa,liquid hourly space velocity 2~36 h·1 and hydrogen/ oil volume ratio 20~40.A power-law kinetic model was used to describe the global kinetics of the series reaction of isoprene selective hydrogenation.The results show that the reaction activation energy of isoprene hydrogenation to isopentene is 44.3 kJ·mol-1,and the reaction orders with respect to isoprene and hydrogen are 0.98 and 0.27,respectively;the reaction activation energy of isopentene hydrogenation to isopentane is 101.1 kJ·mol-1,the reaction orders with respect to isopentene and hydrogen are 1.57 and 1.09,respectively.The statistical test and the comparison of the isoprene conversion ratio and isopentene selectivity obtained by experiments to those obtained by the calculation results of the model indicate that the model used is reliable.

关 键 词：二烯烃 宏观动力学 选择性加氢 活化能 

分 类 号：TE624.43[石油与天然气工程—油气加工工程]